<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <section>
        <h1>一级标题</h1>

        <section>
            <h2>二级标题</h2>
            <p>段落内容</p>
        </section>

        <section>
            <h2>二级标题</h2>
            <p>段落内容</p>
        </section>

        <aside>
            <p>广告内容</p>
        </aside>

    </section>

    <footer>
        <p>某某公司出品</p>
    </footer>
</body>

</html>